Mecha-Bowser Mayhem is a single-player minigame in Mario Power Tennis. The minigame is played on the Bowser's Castle Court. The objective of the game is to defeat Mecha-Bowser, who is on a rampage. The player has to toss powered-up tennis balls at Mecha-Bowser and defeat it before Mecha-Bowser defeats the player. However, the player can also use the Bob-ombs and Bullet Bills that it shoots occasionally to deflect back at it. Mecha-Bowser may also breathe fire onto the field, which covers a wide area and can damage the player. The player is also able to use other power-ups such as Mushrooms or Stars to assist them in the game. Mushrooms speed the player up, and Stars make the player invincible for a short while. It has three difficulties: Aluminum Frame, Iron Frame, and Titanium Frame. The only difference between these difficulties is that Mecha-Bowser will have higher health in the harder difficulties.
In the Wii version of the game, the player may not shoot powered-up energy balls until they get a mushroom, which does not speed them up. Also, the game is easier, as Mecha-Bowser's attacks do less damage to the player, and more Bob-ombs and Bullet Bills appear. Also, if one gets a star, in addition to being invincible, one will be able to shoot more powerful energy balls. Finally, one can charge the energy balls up.
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